[BUGFIX] Fix SubscriberList to Subscriber relationship definition by …#312

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bizmate:failing-doctrine-many2many-validation

Commits on Feb 7, 2020

[BUGFIX] Fix SubscriberList to Subscriber relationship definition by adding changing invertedBy to mappedBy in Subscriber
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[BUGFIX] Adding doctrine schema validation test in travis and extra description in the contribution document.
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